backup_pr_files.sh

#!/bin/bash

# Exit immediately if a command fails
set -e

# Store the current branch name
ORIGINAL_BRANCH=$(git rev-parse --abbrev-ref HEAD)

# Check if PR number is provided
if [ -z "$1" ]; then
    echo "❌ Error: Please provide a PR number."
    echo "Usage: ./backup_pr_files.sh <PR_NUMBER>"
    exit 1
fi

PR_NUMBER=$1
BACKUP_DIR="backup_pr_${PR_NUMBER}"
ZIP_FILE="${BACKUP_DIR}.zip"
BACKUP_LOCATION="./backups"

echo "🔍 Current branch: $ORIGINAL_BRANCH"

# Fetch the PR branch from GitHub
echo "📥 Fetching PR #${PR_NUMBER}..."
git fetch origin pull/${PR_NUMBER}/head:pr-${PR_NUMBER}

# Checkout to the PR branch
echo "🔄 Switching to PR branch..."
git checkout pr-${PR_NUMBER}

# Get the list of changed files
echo "📄 Identifying changed files..."
git diff --name-only develop...pr-${PR_NUMBER} > changed_files.txt

# Create backup directory
echo "📂 Creating backup directory: ${BACKUP_DIR}..."
mkdir -p ${BACKUP_DIR}

# Copy changed files to the backup directory
echo "📑 Copying changed files..."
while read -r file; do
    if [ -f "$file" ]; then
        mkdir -p "${BACKUP_DIR}/$(dirname "$file")"
        cp --parents "$file" "${BACKUP_DIR}/"
    fi
done < changed_files.txt

# Create ZIP archive
echo "📦 Creating ZIP archive: ${ZIP_FILE}..."
mkdir -p ${BACKUP_LOCATION}
zip -r ${BACKUP_LOCATION}/${ZIP_FILE} ${BACKUP_DIR}

# Cleanup: Remove temporary files and backup directory
echo "🧹 Cleaning up temporary files..."
rm -rf ${BACKUP_DIR}
rm changed_files.txt

# Return to the original branch
echo "🔄 Switching back to the original branch: ${ORIGINAL_BRANCH}..."
git checkout ${ORIGINAL_BRANCH}

echo "✅ Backup completed successfully!"
echo "📁 The ZIP file is located at: ${BACKUP_LOCATION}/${ZIP_FILE}"